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Eccentric isometrics (EIs) are a movement where the eccentric portion of the lift is lowered in a controlled manner, and then held in that position for a pre-determined time before completing the actual lifting phase of the movement.

Given that EI's use tempos that aren't "normal," it's best to perform movements in the 1-6 rep range. The eccentric portion of the movement should last between 3-6 seconds with the isometric being held for anywhere between 2-7 seconds.
Any less and you'll negate the benefits from pausing in the lengthened position, and any longer will add to fatigue, again negating the intended outcomes. – Jacob James